Seattle / Tacoma (SEA) to Boston (BOS) flight deal in economy from $303

United AirlinesUAUnited Airlines
Round Trip•Economy
United StatesSEA

Seattle–Tacoma International Airport

Seattle / Tacoma, United States
United StatesBOS

Logan International Airport

Boston, United States
$421 USD
-28%$303 USD
Verified 1 day ago
Limited Availability
10% of dates checked are available within 10% of the lowest price

Sunday, August 2nd, 2026

6 round-trip options

Returning
Fri, Aug 7, 2026•5 Day Trip
$712 USD
Google Flights
Returning
Sat, Aug 8, 2026•6 Day Trip
$675 USD
Google Flights
Returning
Sun, Aug 9, 2026•7 Day Trip
$753 USD
Google Flights
Returning
Mon, Aug 10, 2026•8 Day Trip
$639 USD
Google Flights
Returning
Wed, Aug 12, 2026•10 Day Trip
$577 USD
Google Flights
Returning
Sun, Aug 16, 2026•14 Day Trip
$643 USD
Google Flights